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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Income Tax Contingency [Line Items]      
Effective rate of income tax (percentage) 14.40% 11.00%  
U.K. statutory tax rate (percentage) 19.00%    
Income tax benefit $ 5,724 $ 3,696  
Deferred tax asset 2,034   $ 1,754
Subsidiaries      
Income Tax Contingency [Line Items]      
Deferred tax asset $ 2,000